Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Durham Landing Strip | Airport | 288 | Warren | 41 20 56 N | 093 31 49 W |
| Durham Post Office (historical) | Post Office | 230 | Marion | 41 19 13 N | 092 57 21 W |
| Durion Creek | Stream | | Delaware | 42 23 44 N | 091 08 06 W |
| Durr Hill | Summit | 391 | Monona | 42 04 28 N | 095 59 40 W |
| Dutch Branch | Stream | | Shelby | 41 33 16 N | 095 16 56 W |
| Dutch Creek | Stream | | Jones | 42 05 36 N | 091 16 33 W |
| Dutch Creek | Stream | | Monona | 42 10 35 N | 095 48 51 W |
| Dutch Creek | Stream | | Washington | 41 13 57 N | 091 55 01 W |
| Dutch Hollow | Valley | | Fremont | 40 49 55 N | 095 43 22 W |
| Dutch Hollow | Valley | | Monona | 42 06 38 N | 095 52 48 W |
| Dutchman Island | Island | 158 | Lee | 40 38 16 N | 091 16 11 W |
| Dutchtown | Populated Place | 301 | Delaware | 42 33 08 N | 091 24 40 W |
| Dutton Cave County Park | Park | 328 | Fayette | 42 59 46 N | 091 46 01 W |
| Dutton Cemetery | Cemetery | 224 | Clinton | 41 51 10 N | 090 40 31 W |
| Dutton Park | Park | 216 | Cedar | 41 36 04 N | 090 54 11 W |
| Dutton Park | Park | 318 | Montgomery | 41 00 27 N | 095 13 31 W |
| Duttons Cave Campground | Locale | 352 | Fayette | 42 59 46 N | 091 46 17 W |
| Dvorak Cemetery | Cemetery | 293 | Tama | 41 58 16 N | 092 20 34 W |
| Dyas Cemetery | Cemetery | 262 | Jackson | 42 14 33 N | 090 25 34 W |
| Dye Creek | Stream | | Story | 41 59 44 N | 093 22 08 W |
| Dyer-Botsford Victorian House and Doll Museum | Building | 293 | Dubuque | 42 29 05 N | 091 07 15 W |
| Dyersville | Locale | 287 | Dubuque | 42 29 13 N | 091 07 23 W |
| Dyersville | Populated Place | 290 | Dubuque | 42 29 04 N | 091 07 22 W |
| Dyersville Elementary School | School | 297 | Dubuque | 42 28 57 N | 091 07 00 W |
| Dyersville Family Practice Center | Hospital | 289 | Dubuque | 42 28 38 N | 091 07 41 W |
| Dyersville Fire Department | Building | 293 | Dubuque | 42 29 05 N | 091 07 14 W |
| Dyersville Golf and Country Club | Locale | 293 | Dubuque | 42 29 58 N | 091 06 50 W |
| Dyersville Police Department | Building | 293 | Dubuque | 42 29 05 N | 091 07 14 W |
| Dyersville Post Office | Post Office | 291 | Dubuque | 42 28 57 N | 091 07 16 W |
| Dysart | Populated Place | 296 | Tama | 42 10 18 N | 092 18 23 W |
| Dysart (historical) | Locale | 296 | Tama | 42 10 23 N | 092 18 31 W |
| Dysart Assembly of God Church | Church | 296 | Tama | 42 10 15 N | 092 18 24 W |
| Dysart Cemetery | Cemetery | 290 | Tama | 42 09 39 N | 092 19 11 W |
| Dysart Clinic | Hospital | 295 | Tama | 42 10 15 N | 092 18 19 W |
| Dysart Country Club | Locale | 310 | Tama | 42 12 35 N | 092 18 06 W |
| Dysart Fairground | Locale | 292 | Tama | 42 09 60 N | 092 18 11 W |
| Dysart Fire Department | Building | 294 | Tama | 42 10 10 N | 092 18 22 W |
| Dysart Library | Building | 294 | Tama | 42 10 10 N | 092 18 22 W |
| Dysart Police Department | Building | 297 | Tama | 42 10 20 N | 092 18 24 W |
| Dysart Post Office | Post Office | 295 | Tama | 42 10 17 N | 092 18 16 W |
| Dysart-Geneseo Elementary School | School | 291 | Tama | 42 10 11 N | 092 18 44 W |
| E B Lyons Nature Center | Building | 241 | Dubuque | 42 27 40 N | 090 39 10 W |
| E B Lyons Prairie-Woodlawn Preserve | Park | 180 | Dubuque | 42 27 35 N | 090 37 33 W |
| E J McKeever Medical Center | Hospital | 289 | Marion | 41 13 25 N | 093 14 31 W |
| Eads (historical) | Locale | 305 | Delaware | 42 33 13 N | 091 24 46 W |
| Eads Post Office (historical) | Post Office | 305 | Delaware | 42 33 13 N | 091 24 46 W |
| Eads' Grove Post Office (historical) | Post Office | 331 | Delaware | 42 34 20 N | 091 23 26 W |
| Eagle Cemetery | Cemetery | 287 | Black Hawk | 42 20 28 N | 092 21 10 W |
| Eagle Center | Populated Place | 290 | Black Hawk | 42 20 27 N | 092 21 27 W |
| Eagle Center Post Office (historical) | Post Office | 290 | Black Hawk | 42 20 27 N | 092 21 27 W |
| Eagle City | Populated Place | 307 | Hardin | 42 28 18 N | 093 08 43 W |
| Eagle City Access Area | Locale | 309 | Hardin | 42 28 32 N | 093 08 49 W |
| Eagle City Post Office (historical) | Post Office | 307 | Hardin | 42 28 18 N | 093 08 43 W |
| Eagle Creek | Stream | | Wright | 42 32 50 N | 093 50 40 W |
| Eagle Flats Wildlife Management Area | Park | 367 | Hancock | 43 10 00 N | 093 44 40 W |
| Eagle Grove | Locale | 341 | Wright | 42 39 60 N | 093 54 06 W |
| Eagle Grove | Populated Place | 340 | Wright | 42 39 51 N | 093 54 16 W |
| Eagle Grove Chiropractic Center | Hospital | 340 | Wright | 42 39 50 N | 093 54 20 W |
| Eagle Grove City Hall | Building | 340 | Wright | 42 39 51 N | 093 54 58 W |
| Eagle Grove Country Club | Locale | 335 | Wright | 42 40 02 N | 093 56 49 W |
| Eagle Grove Evangelical Lutheran Church | Church | 339 | Wright | 42 39 44 N | 093 54 35 W |
| Eagle Grove High School | School | 341 | Wright | 42 39 60 N | 093 54 23 W |
| Eagle Grove Junior High School | School | 339 | Wright | 42 40 03 N | 093 54 54 W |
| Eagle Grove Memorial Library | Building | 339 | Wright | 42 39 50 N | 093 54 29 W |
| Eagle Grove Municipal Airport | Airport | 344 | Wright | 42 42 35 N | 093 54 58 W |
| Eagle Grove Museum | Building | 339 | Wright | 42 39 52 N | 093 54 29 W |
| Eagle Grove Physical Therapy | Hospital | 339 | Wright | 42 39 50 N | 093 54 10 W |
| Eagle Grove Police Department | Building | 339 | Wright | 42 39 50 N | 093 54 14 W |
| Eagle Grove Post Office | Post Office | 340 | Wright | 42 39 48 N | 093 54 22 W |
| Eagle Grove Post Office (historical) | Post Office | 342 | Wright | 42 41 15 N | 093 56 01 W |
| Eagle Grove Township Cemetery (historical) | Cemetery | 342 | Wright | 42 40 50 N | 093 55 51 W |
| Eagle Lake | Lake | 412 | Emmet | 43 29 17 N | 094 49 42 W |
| Eagle Lake | Lake | 370 | Hancock | 43 07 44 N | 093 44 03 W |
| Eagle Lake (historical) | Lake | 361 | Kossuth | 43 27 02 N | 094 23 26 W |
| Eagle Lake State Game Management Area | Park | 370 | Hancock | 43 07 34 N | 093 43 55 W |
| Eagle Lake State Park | Park | 372 | Hancock | 43 07 31 N | 093 44 30 W |
| Eagle Lake Wildlife Management Area | Park | 412 | Emmet | 43 29 22 N | 094 49 36 W |
| Eagle Lake Woodland Area | Park | 372 | Hancock | 43 07 10 N | 093 44 06 W |
| Eagle Point | Cape | 427 | Dickinson | 43 21 55 N | 095 09 45 W |
| Eagle Point | Populated Place | 183 | Dubuque | 42 32 05 N | 090 38 40 W |
| Eagle Point Bridge | Bridge | 180 | Dubuque | 42 32 13 N | 090 38 37 W |
| Eagle Point Nursing and Rehabilitation Center | Hospital | 193 | Clinton | 41 52 40 N | 090 11 25 W |
| Eagle Point Park | Park | 229 | Clinton | 41 54 13 N | 090 10 45 W |
| Eagle Point Park | Park | 237 | Dubuque | 42 32 17 N | 090 38 59 W |
| Eagle Ridge Community | Populated Place | 247 | Linn | 42 02 20 N | 091 33 16 W |
| Eagle Ridge Park | Park | 245 | Linn | 42 02 12 N | 091 33 06 W |
| Eagle Ridge Park | Park | 277 | Polk | 41 38 25 N | 093 29 13 W |
| Eagle Rock | Cliff | 285 | Allamakee | 43 05 30 N | 091 11 10 W |
| Eagle Rock | Pillar | 226 | Jones | 42 10 09 N | 090 54 57 W |
| Eagle School | Locale | 363 | Dubuque | 42 32 14 N | 090 58 32 W |
| Eagle School | School | 177 | Lee | 40 26 00 N | 091 30 23 W |
| Eagles Landing Park | Park | 171 | Scott | 41 33 00 N | 090 26 20 W |
| Eakpicada County Park | Park | 247 | Linn | 42 11 06 N | 091 31 09 W |
| Ear Nose and Throat Clinic | Hospital | 308 | Poweshiek | 41 44 34 N | 092 44 03 W |
| Ear Nose and Throat Surgical Associates Center | Hospital | 255 | Wapello | 41 01 45 N | 092 23 23 W |
| Ear Nose Throat Center of Southeast Iowa | Hospital | 203 | Wapello | 41 01 08 N | 092 24 39 W |
| Earhart Cemetery | Cemetery | 193 | Johnson | 41 33 45 N | 091 33 06 W |
| Earle (historical) | Locale | 334 | Lucas | 40 55 20 N | 093 28 21 W |
| Earle Post Office (historical) | Post Office | 336 | Lucas | 40 55 20 N | 093 28 51 W |
| Earlham | Locale | 337 | Madison | 41 29 24 N | 094 07 22 W |
| Earlham | Populated Place | 336 | Madison | 41 29 31 N | 094 07 27 W |
| Earlham Bridge Access | Locale | 268 | Dallas | 41 33 20 N | 094 04 41 W |
| Earlham Cemetery | Cemetery | 333 | Madison | 41 29 24 N | 094 06 41 W |
| Earlham City Hall | Building | 337 | Madison | 41 29 26 N | 094 07 22 W |
| Earlham Friends Church | Church | 336 | Madison | 41 29 31 N | 094 07 27 W |
| Earlham Library | Building | 337 | Madison | 41 29 26 N | 094 07 22 W |
| Earlham Medical Clinic | Hospital | 336 | Madison | 41 29 31 N | 094 07 27 W |
| Earlham Police Department | Building | 337 | Madison | 41 29 26 N | 094 07 22 W |
| Earlham Post Office | Post Office | 336 | Madison | 41 29 31 N | 094 07 27 W |
| Earlham Senior High School | School | 333 | Madison | 41 29 44 N | 094 07 25 W |